Accelerator Pump; Adjusting Screws - Stihl MS 441 Manual

2
– Coat screw with screw locking
adhesive, b 17.
: Fit new screw (1) in flat side of
shaft and tighten it lightly.
– Close throttle shutter (2) and
centre it in the hole of the
carburetor housing so that
a small air gap remains.
The recess (arrow) in the throttle
shutter must line up with the small
hole in the carburetor housing.
– Tighten screw securely.
– Check correct operation and
easy movement.
– Reassemble all other parts in the
reverse sequence.
MS 441, MS 441 C

14.4.8 Accelerator pump

1
: Prise out sealing plug (arrow).
– Remove throttle shaft,
b 14.4.7.
1 2
– Put on protective goggles and
cover the hole in the accelerator
pump with your fingers to prevent
the parts popping out.
: Examine ball (1), pump piston (2)
and spring (3), replace pump
piston set if necessary.
– Press a new sealing plug in until
flush with the hollow facing
outwards.
– Reassemble all other parts in the
reverse sequence.

14.4.9 Adjusting screws

3
There are three adjusting screws on
the carburetor
H = High speed screw (1)
L = Low speed screw (2)
LA = Idle speed screw (3)
If the carburetor can no longer be
adjusted, this may also be due to
the adjusting screws.
3
The high speed screw H and low
speed screw L have limiter caps
which must be removed before
removing the adjusting screws.
Always use new limiter caps.
– Remove carburetor, b 14.3.
– See also carburetor
troubleshooting chart, b 4.6.
Low speed screw
: Screw puller (1) 5910 890 4500
onto limiter cap – left-hand
thread.
1
2
H
1
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